Canelo Alvarez could prove to be Floyd Mayweather's most difficult opponent in some time.
The undefeated WBC light middleweight champ was not intimidated at the weigh-ins, calmly looking straight into Mayweather's eyes at 152 pounds.

Nonito Donaire lowered the boom on Jorge Arce Saturday night in Houston.
The bout was barely almost three rounds old when the WBO super bantamweight champion knocked out the Mexican challenger for good after flooring him in the second round.